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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
This hook occurs 3 times in this file.
| Line | Code |
|---|---|
| 1096 | if ($day != $previousday) { |
| 1097 | return(1); |
| 1098 | } else { |
| 1099 | return(0); |
| 1100 | } |
| 1101 | } |
| 1102 | |
| 1103 | // Filters: these are the core of WP's plugin architecture |
| 1104 | |
| 1105 | function apply_filters($tag, $string) { |
| 1106 | global $wp_filter; |
| 1107 | if (isset($wp_filter['all'])) { |
| 1108 | foreach ($wp_filter['all'] as $priority => $functions) { |
| 1109 | if (isset($wp_filter[$tag][$priority])) |
| 1110 | $wp_filter[$tag][$priority] = array_merge($wp_filter['all'][$priority], $wp_filter[$tag][$priority]); |
| 1111 | else |
| 1112 | $wp_filter[$tag][$priority] = array_merge($wp_filter['all'][$priority], array()); |
| 1113 | $wp_filter[$tag][$priority] = array_unique($wp_filter[$tag][$priority]); |
| 1114 | } |
| Line | Code |
| 1145 | } |
| 1146 | $wp_filter[$tag]["$priority"] = $new_function_list; |
| 1147 | } |
| 1148 | //die(var_dump($wp_filter)); |
| 1149 | return true; |
| 1150 | } |
| 1151 | |
| 1152 | // The *_action functions are just aliases for the *_filter functions, they take special strings instead of generic content |
| 1153 | |
| 1154 | function do_action($tag, $string) { |
| 1155 | return apply_filters($tag, $string); |
| 1156 | } |
| 1157 | |
| 1158 | function add_action($tag, $function_to_add, $priority = 10) { |
| 1159 | add_filter($tag, $function_to_add, $priority); |
| 1160 | } |
| 1161 | |
| 1162 | function remove_action($tag, $function_to_remove, $priority = 10) { |
| 1163 | remove_filter($tag, $function_to_remove, $priority); |
| 1164 | } |